how fast is the flash?

TLDR: The Flash, connected to the Speed Force, can run at incredible speeds, often depicted as faster than light, with some storylines suggesting he can reach speeds up to 13 trillion times the speed of light. His abilities allow him to manipulate time and avoid obstacles at superhuman speeds, making him one of the most powerful characters in the DC Universe.

The Flash's extraordinary speed is primarily due to his connection to the Speed Force, a powerful energy field that grants him abilities that defy the laws of physics. Barry Allen, the most recognized version of the Flash, gained his powers after a lightning strike and exposure to chemicals. His speed is often quantified in various ways, with depictions showing him running faster than the speed of light, and in some instances, achieving speeds up to 500 times or even 13 trillion times the speed of light. Additionally, he can perform feats akin to instant teleportation and manipulate time, showcasing the extent of his abilities.

While scientific explanations for the Flash's speed remain speculative, theories suggest he generates a Speed Force aura that protects him from friction and heat, and his brain processes information at an accelerated rate, allowing him to navigate complex environments effortlessly. Compared to other speedsters, such as Marvel's Quicksilver, the Flash is significantly faster due to his unique connection to the Speed Force, solidifying his status as the fastest superhero in the DC Universe.